### Transcription for Educational Website**Table Data:**| ENTREE_CODE | EN3 | EN3 | EN5 ||----------------|--------------|--------------|--------------------|| ENTREE_DESCRIPTION | Stuffed crab | Stuffed crab | Marinated steak || DESERT_CODE | DE8 | DE5 | DE2 || DESERT_DESCRIPTION | Chocolate mousse with raspberry sauce | Cherries jubilee | Apple pie with honey crust |**Instructional Tasks Based on the Table:**a) **Task**: Given the table structure illustrated above, write its relational schema and draw its dependency diagram. Label all transitive and/or partial dependencies. **Note**: For this example, you can use the table name and attribute names as given even though they don’t strictly follow the relational schema naming conventions given in the notes. You can also create a shortened version of these attribute names if it is easier to work with.b) **Task**: Break up the dependency diagram you drew in part (a) to produce dependency diagrams that are in 3NF and write the relational schema. **Hint**: You might have to create a few new attributes. Also, make sure that the new dependency diagrams contain attributes that meet proper design criteria; that is, make sure that there are no multivalued attributes, and so on.c) **Task**: Draw the Crow’s Foot ERD to reflect the dependency diagrams you drew in Part (b).### Explanation:- The table has a composite structure with `ENTREE_CODE` associated with `ENTREE_DESCRIPTION` and `DESERT_CODE` associated with `DESERT_DESCRIPTION`. - The tasks involve creating dependency diagrams to identify and eliminate transitive and partial dependencies, ensuring adherence to the Third Normal Form (3NF). This process involves decomposing the tables appropriately and designing a relational schema.- Finally, a Crow’s Foot Entity-Relationship Diagram (ERD) is to be created to visually represent the database structure based on the refined dependency diagrams.This instructional content focuses on normalizing a database to improve its structure and eliminate redundancy, a crucial skill in database management and design. **Q3. Database Design for a Company Dinner Club**The database must enable the manager of a company dinner club to manage dinner invitations, plan meals, and track attendance. Key business rules include:- Each dinner serves multiple members, and each member may attend various dinners.- Each member can receive multiple invitations, with each invitation sent to multiple members.- A dinner revolves around a single entree, usable across many dinners, e.g., combinations like fish with rice, or potatoes with string beans.Given the manager lacks database expertise, the initial database design structure appears in the table below:| Attribute Name | Sample Value | Sample Value | Sample Value ||--------------------|------------------|---------------------|------------------|| MEMBER_NUM | 214 | 235 | 214 || MEMBER_NAME | Alice B. VanderVoort | Gerald M. Gallega | Alice B. VanderVoort || MEMBER_ADDRESS | 325 Meadow Park | 123 Rose Court | 325 Meadow Park || MEMBER_CITY | Murkywater | Highlight | Murkywater || MEMBER_ZIPCODE | 12345 | 12349 | 12345 || INVITE_NUM | 8 | 9 | 10 || INVITE_DATE | 23-Feb-2016 | 12-Mar-2016 | 23-Feb-2016 || ACCEPT_DATE | 27-Feb-2016 | 15-Mar-2016 | 27-Feb-2016 || DINNER_DATE | 15-Mar-2016 | 17-Mar-2016 | 15-Mar-2016 || DINNER_ATTENDED | Yes | Yes | No || DINNER_CODE | DI5 | DI5 | DI2 || DINNER_DESCRIPTION | Glowing sea delight | Glowing sea delight | Ranch Superb |This setup provides a foundational layout for tracking the requisite information about dinners, invitations, and member participation.

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ENTREE_CODE ENTREE_DESCRIPTION DESERT_CODE DESERT_DESCRIPTION EN3 Stuffed crab DE8 Chocolate mousse with raspberry sauce EN3 Stuffed crab DE5 Cherries jubilee EN5 Marinated steak DE2 Apple pie with honey crust Given the information in the table above: a) Given the table structure illustrated above, write its relational schema and draw its dependency diagram. Label all transitive and/or partial dependencies. (Note: For this example, you can use the table name and attribute names as given even though they don't strictly follow the relational schema naming conventions given in the notes. You can also create a shortened version of these attribute names if it is easier to work with). b) Break up the dependency diagram you drew in part (a) to produce dependency diagrams that are in 3NF and write the relational schema. (Hint: You might have to create a few new attributes. Also, make sure that the new dependency diagrams contain attributes that meet proper design criteria; that is, make sure that there are no multivalued attributes, and so on.) c) Draw the Crow's Foot ERD to reflect the dependency diagrams you drew in Part (b).

ENTREE_CODE ENTREE_DESCRIPTION DESERT_CODE DESERT_DESCRIPTION EN3 Stuffed crab DE8 Chocolate mousse with raspberry sauce EN3 Stuffed crab DE5 Cherries jubilee EN5 Marinated steak DE2 Apple pie with honey crust Given the information in the table above: a) Given the table structure illustrated above, write its relational schema and draw its dependency diagram. Label all transitive and/or partial dependencies. (Note: For this example, you can use the table name and attribute names as given even though they don't strictly follow the relational schema naming conventions given in the notes. You can also create a shortened version of these attribute names if it is easier to work with). b) Break up the dependency diagram you drew in part (a) to produce dependency diagrams that are in 3NF and write the relational schema. (Hint: You might have to create a few new attributes. Also, make sure that the new dependency diagrams contain attributes that meet proper design criteria; that is, make sure that there are no multivalued attributes, and so on.) c) Draw the Crow's Foot ERD to reflect the dependency diagrams you drew in Part (b).

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

SQL

SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.

Question

### Transcription for Educational Website

**Table Data:**

| ENTREE_CODE | EN3 | EN3 | EN5 |
|----------------|--------------|--------------|--------------------|
| ENTREE_DESCRIPTION | Stuffed crab | Stuffed crab | Marinated steak |
| DESERT_CODE | DE8 | DE5 | DE2 |
| DESERT_DESCRIPTION | Chocolate mousse with raspberry sauce | Cherries jubilee | Apple pie with honey crust |

**Instructional Tasks Based on the Table:**

a) **Task**: Given the table structure illustrated above, write its relational schema and draw its dependency diagram. Label all transitive and/or partial dependencies.

**Note**: For this example, you can use the table name and attribute names as given even though they don’t strictly follow the relational schema naming conventions given in the notes. You can also create a shortened version of these attribute names if it is easier to work with.

b) **Task**: Break up the dependency diagram you drew in part (a) to produce dependency diagrams that are in 3NF and write the relational schema.

**Hint**: You might have to create a few new attributes. Also, make sure that the new dependency diagrams contain attributes that meet proper design criteria; that is, make sure that there are no multivalued attributes, and so on.

c) **Task**: Draw the Crow’s Foot ERD to reflect the dependency diagrams you drew in Part (b).

### Explanation:

- The table has a composite structure with `ENTREE_CODE` associated with `ENTREE_DESCRIPTION` and `DESERT_CODE` associated with `DESERT_DESCRIPTION`.

- The tasks involve creating dependency diagrams to identify and eliminate transitive and partial dependencies, ensuring adherence to the Third Normal Form (3NF). This process involves decomposing the tables appropriately and designing a relational schema.

- Finally, a Crow’s Foot Entity-Relationship Diagram (ERD) is to be created to visually represent the database structure based on the refined dependency diagrams.

This instructional content focuses on normalizing a database to improve its structure and eliminate redundancy, a crucial skill in database management and design.

**Q3. Database Design for a Company Dinner Club**

The database must enable the manager of a company dinner club to manage dinner invitations, plan meals, and track attendance. Key business rules include:

- Each dinner serves multiple members, and each member may attend various dinners.
- Each member can receive multiple invitations, with each invitation sent to multiple members.
- A dinner revolves around a single entree, usable across many dinners, e.g., combinations like fish with rice, or potatoes with string beans.

Given the manager lacks database expertise, the initial database design structure appears in the table below:

| Attribute Name | Sample Value | Sample Value | Sample Value |
|--------------------|------------------|---------------------|------------------|
| MEMBER_NUM | 214 | 235 | 214 |
| MEMBER_NAME | Alice B. VanderVoort | Gerald M. Gallega | Alice B. VanderVoort |
| MEMBER_ADDRESS | 325 Meadow Park | 123 Rose Court | 325 Meadow Park |
| MEMBER_CITY | Murkywater | Highlight | Murkywater |
| MEMBER_ZIPCODE | 12345 | 12349 | 12345 |
| INVITE_NUM | 8 | 9 | 10 |
| INVITE_DATE | 23-Feb-2016 | 12-Mar-2016 | 23-Feb-2016 |
| ACCEPT_DATE | 27-Feb-2016 | 15-Mar-2016 | 27-Feb-2016 |
| DINNER_DATE | 15-Mar-2016 | 17-Mar-2016 | 15-Mar-2016 |
| DINNER_ATTENDED | Yes | Yes | No |
| DINNER_CODE | DI5 | DI5 | DI2 |
| DINNER_DESCRIPTION | Glowing sea delight | Glowing sea delight | Ranch Superb |

This setup provides a foundational layout for tracking the requisite information about dinners, invitations, and member participation.

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